Submission #1092477

#	Time	Username	Problem	Language	Result	Execution time	Memory
1092477		Nom_mxmx	Two Currencies (JOI23_currencies)	C++14	100 / 100	771 ms	45900 KiB

currencies

#include <bits/stdc++.h>
using namespace std;

typedef long long ll;
#define endl '\n'
#define fi first 
#define se second
#define pb push_back

struct path {
    int x, y, lca;
    ll g, s;
};

struct binS {
    int lo, hi, mid;
};

const int N = 1e5+3;
const int B = (1<<18);
const int L = 17;
pair<ll, int> T[2*B+3];
pair<int, int> edg[N];
pair<int, int> price[N];
vector<int> g[N];
vector<int> mids[N];
binS bin[N];
path p[N];
int jump[N][L+1];
int ans[N];
int d[N];
int siz[N];
int pre[N];
int n, m, q;
int ind;

void dfs(int v, int p) {
    pre[v] = ++ind;
    siz[v] = 1;
    d[v] = d[p]+1;
    jump[v][0] = p;
    for(auto u:g[v]) {
        if(u == p) continue;
        dfs(u, v);
        siz[v] += siz[u];
    }
}

int lca(int a, int b) {
    if(d[a] < d[b]) swap(a, b);

    for(int i=L; i>=0; i--)
        if(d[jump[a][i]] >= d[b]) a = jump[a][i];

    for(int i=L; i>=0; i--) {
        if(jump[a][i] != jump[b][i]) {
            a = jump[a][i];
            b = jump[b][i];
        }
    }

    if(a == b) return a;
    return jump[a][0];
}

void clr() {
    for(int i=1; i<2*B+3; i++)
        T[i] = {0, 0};
}

void upd(int a, int b, int x, int v=1, int l=1, int r=B-1) {
    if(l > b || r < a) return;
    if(l >= a && r <= b) {
        T[v].fi += x;
        T[v].se += 1;
        return;
    }
    upd(a, b, x, 2*v, l, (l+r)/2);
    upd(a, b, x, 2*v+1, (l+r)/2+1, r);
}

pair<ll, int> cnt(int v) {
    pair<ll, int> a = {0, 0};
    v += B-1;

    while(v > 0) {
        a.fi += T[v].fi;
        a.se += T[v].se;
        v /= 2;
    }
    return a;
}

void parallel() {
    int lft = q;
    while(lft) {
        clr();
        for(int i=1; i<=m; i++) {
            // numer krawedzi jest w price[i].se;
            int curEdg = price[i].se;
            int num = edg[curEdg].fi;
            if(d[edg[curEdg].fi] < d[edg[curEdg].se]) num = edg[curEdg].se;
            upd(pre[num], pre[num] + siz[num] - 1, price[i].fi);
            
            for(auto x:mids[i]) {
                pair<ll, int> v1 = cnt(pre[p[x].x]);
                pair<ll, int> v2 = cnt(pre[p[x].y]);
                pair<ll, int> lc = cnt(pre[p[x].lca]);
                pair<ll, int> path = {v1.fi + v2.fi - 2*lc.fi, v1.se + v2.se - 2*lc.se};


                if(p[x].s >= path.fi) {
                    bin[x].lo = i;
                    ans[x] = path.se;
                }
                else bin[x].hi = i-1;

                bin[x].mid = (bin[x].lo + bin[x].hi + 1)/2;
                if(bin[x].lo == bin[x].hi) lft--;
                else mids[bin[x].mid].pb(x);
            }

            mids[i].clear();
            mids[i].shrink_to_fit();
        }
    }
}

int main() {
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cin >> n >> m >> q;

    for(int i=1; i<n; i++) {
        cin >> edg[i].fi >> edg[i].se;
        g[edg[i].fi].pb(edg[i].se);
        g[edg[i].se].pb(edg[i].fi);
    }

    dfs(1, 0);
    for(int i=1; i<=L; i++)
        for(int j=1; j<=n; j++)
            jump[j][i] = jump[jump[j][i-1]][i-1]; 

    for(int i=1; i<=m; i++)
        cin >> price[i].se >> price[i].fi;
    
    sort(price+1, price+m+1);

    for(int i=1; i<=q; i++) {
        cin >> p[i].x >> p[i].y >> p[i].g >> p[i].s;
        p[i].lca = lca(p[i].x, p[i].y);
        bin[i].lo = 0;
        bin[i].hi = m;
        bin[i].mid = (m+1)/2;
        mids[bin[i].mid].pb(i);
    }

    parallel();

    for(int i=1; i<=q; i++) {
        pair<ll, int> v1 = cnt(pre[p[i].x]);
        pair<ll, int> v2 = cnt(pre[p[i].y]);
        pair<ll, int> lc = cnt(pre[p[i].lca]);
        pair<ll, int> path = {v1.fi + v2.fi - 2*lc.fi, v1.se + v2.se - 2*lc.se};

        int Ans = p[i].g - (path.se - ans[i]);
        cout << max(Ans, -1) << endl;
    }
}

• Subtask 1: 10 / 10
• Subtask 2: 28 / 28
• Subtask 3: 30 / 30
• Subtask 4: 32 / 32